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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 7:40:38 PM
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UCREFRP
UCREFRP Catalog Number
8289
Author
Trammell, M. and T. Chart.
Title
Flaming Gorge Studies
USFW Year
1997.
USFW - Doc Type
Colorado Squawfish Yoy Habitat Use, Green River, utah, 1992-1996.
Copyright Material
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r)RAFT4 <br /> <br />On each trip, every backwater. and many other low-velocity habitats within the 16- <br />kilometer study reach were seined, and physical habitat measurements were taken similarly to the <br />ISMP handbook guidelines. Sampling procedures departed from those of ISMP in that there were <br />no size restrictions for habitats, and three data transects instead of one were taken, at the mouth, <br />1/3 and 2/3 of the length. At each transect, we took measurements at the point of maximum water <br />depth, and 1/2 way to either side. Depths of water only, and water plus substrate (unconsolidated <br />sediment) were measured. Primary and secondary substrate types were recorded at each poim. <br />Sub-surface temperatures (°C) were recorded at the midpoint of each transect. Turbidity was <br />gauged on a subjective scale from 0 (clear) to 1 (6" of visibility) and 2 (< 2" of visibility). <br />Temperature and turbidity of the adjacent main channel were also recorded. <br />To examine the degree-day relationship between the main channel, backwaters_and <br />squawfish, remote temperature recorders were set to record mid-column temperatures in the main <br />channel and in backwaters where squawfish have been collected. Temperatures were taken every <br />two hours. Data from these recorders is not continuous due to equipment loss and failures. <br />Each sampling trip was coordinated with avideo-imaging overflight conducted by the BOR <br />Individual habitats were mapped onto aerial videographs and overlays to determine seasonal <br />overlap, and to determine their persistence through time. Habitat persistence was evaluated <br />beginning with post-flood habitats and ending in spring prior to the flood. Habitats that were <br />ephemeral within the season (sampled only once) were rated 0, those which were seasonally <br />stable (sampled twice) rated 1, and those annually stable (through winter) rated 2. <br />Habitat types were classified according to the scheme developed in 1992 with hydrologist <br />Dr. Jack Schmidt (USLI) for Objective 2, which relates types of habitats back to the hydrological <br />-~- <br />
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